And if A, how would you prefer to see it done? Based on a non-primary stat for martial artists (probably strength)? Or something else?
As it stands now, I see two problems with it:
a) It deals too much damage, and by using the [W] expression, it adds enhancement bonuses and other weapon-derived stuff (Weapon Focus), which makes it very damaging.
b) It clears minions in a big, big field, simply by being too close to the MA.
Personally, I see this as a possible "fix", or at least as a route to go:
To fix a), it should just deal damage equal to a stat modifier. This lowers the damage and avoids piling up additional bonuses.
Fixing b) is a bit harder, but I think doing the damage
when an enemy ends it turn within 2 squares would do.
That way, minions are only killed if they move close
and stay here. Furthermore, it ties into the general theme of strikers of being able to avoid attacks by the enemy - usually this is done by being movement.
This version of Demon Dance would effectively set up a disincentive to attack the MA directly, especially for weaker enemies.
The power is still interesting, as in conjunction with slow/immobilisation effects it is still very effect - effects the MA can use (and it also encourages teamwork).
Cheers, LT.